[Mono-dev] System.Math implementation

[Rusmin Susanto]

Hi all. I have some questions to ask:
   
  1. In the folder /mono/mcs/class/corlib/System there is a file Math.cs. Some functions in this class (eg. Sin, Cos, etc) are implemented in C. For example, the Sin function is declared as 
   
   [MethodImplAttribute (MethodImplOptions.InternalCall)]
 public extern static double Sin (double x);
   
  I tried to find the C implementation for the Sin function above. It looks like that it is implemented in /mono/mono/metadata/sysmath.c (see line 70). When I modify this function (eg. return (2.0 * sin (x)), why do I still get the same output? Why don't I get 2 * sin (x)?
  
If sysmath.c does not contain the implementaton, where is the Math.Sin() implemented?
  I really want to know how this works.
  
2. I know that the C# is written in C#. However, I believe that the very basic functionality of that C# compiler is implemented in C (am I right?). If yes, where can I find that C implementation?
  
Many thanks for your attention
   
  
Rusmin

		
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